有限元法分析犬下颌不全截骨牵张时特定标志点应力状况

Canine mandibular stress analysis by finite element method when Partial-cortical-cutting distraction osteogenesis

目的:利用犬不完全截骨牵张成骨有限元模型计算牵张过程中下颌骨特定点受力状况。方法:有限元模型模拟不完全截骨(截骨处剩1mm舌侧皮质骨),观察下颌骨特定标志点所受最大主应力和Von Mises应力。结果:犬下颌不全截骨牵张时,在牵张侧下颌角、喙突受到较大应力,第五臼齿、髁状突前斜面前缘中点和髁状突后斜面后缘中点VonMises应力分别为:0.3726 MPa、0.2408 MPa、0.1051 MPa,并且前两点所受最大主应力为压应力、后缘中点为拉应力,在非牵张侧应力为0。结论:犬下颌骨不全截骨牵张成骨时,牵张侧受到不同程度应力影响,在非牵张侧不受应力影响。

Objective：Try to observe the biomechanics environment of every mandibular part duing distraction osteogenesis by means of the finite element model of canine Partial-cortical-cutting distraction osteogenesis. Method： The method of finite element analysis was used to simulate Partial-cortical-cutting the distraction osteogenesis. The principal stress major and Von mises stress cloud chart of some points marked in the manciible were observed in ＂cut＂ situation when 1 mm wide of slice was retained during distraction osteogenesis with the force of 12 newton. Result：when the slide segment was retained lmm width, the Von Mises stress of the fifth cheek tooth,anterior edge midpoint of condyle process anterior slope.posterior edge midpoint of condyle process posterior slope were respectively 0.3726.0.2408,0.1051Mpa and the principal stress major of the first two points were press stress and that of the last one was pull stress at the side of distraction.There were no effect of stress at the side of nondistraction. Conclusion： When canine Partial-cortical-cutting the distraction osteogenesis,There has any effect of stress at the side of distraction and no effect of stress at the side of nondistraction.